Flexible channel state information configuration

Abstract

Measures are provided for flexible channel state information configuration. Such measures exemplarily include receiving, from a terminal, radio channel quality report configuration feedback information established based on at least one reference signal, generating a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, the modified radio channel quality report configuration for the terminal differing from the initial radio channel quality report configuration for the terminal by at least one report configuration parameter, and sending, to the terminal, information indicating the modified radio channel quality report configuration for the terminal.

Description

Technical Field

[0001] Various example embodiments relate to flexible channel state information configuration. More specifically, various example embodiments exemplarily relate to measures (including methods, apparatus, and computer program products) for implementing flexible channel state information configuration. Background Technology

[0002] This specification generally covers CSI reconfigurability, CSI bit overhead, CSI for high speed, and Time Domain Channel Properties (TDCP).

[0003] The latest related version 18 CSI enhancements introduce two new types of codebook extensions. One type of codebook extension is the CJT case, which is an extension of the legacy version 16 for multiple TRPs and still uses spatial-frequency compression; and the Doppler codebook extension, which uses prediction and time-Doppler domain compression (on top of spatial-frequency compression) to address CSI aging issues at a higher speed.

[0004] The following section explains how to compress CSI using the 3GPP Type II codebook as a reference. This 3GPP Type II codebook has been further enhanced from version 15 to the current version 18. This description focuses on the space-frequency CSI compression process.

[0005] The channel can be represented by an explicit channel tensor defined in three dimensions: by gNB The spatial components represented by each antenna port; the frequency components defined by the bandwidth consisting of multiple physical resource blocks (PRBs); and finally, all the components in the UE. R Each receiver antenna and its respective space-frequency measurement. In fact, the current 3GPP standard does not explicitly report the channel, but the associated precoding matrix required for the corresponding space-frequency beamforming is the precoding matrix that the UE actually provides to the network in the CSI report.

[0006] The CSI obtained from the precoding matrix is ​​initially derived from singular value decomposition (SVD) or eigenvalue decomposition (EVD) applied to the channel or the associated channel correlation matrix.

[0007] Figure 7 The channel characterization is schematically illustrated, and specifically the space-frequency channel / precoding matrix tensor set, and the resulting CSI (PMI) compression after being transformed to the beam-delay domain with a selected transmission rank.

[0008] like Figure 7As shown, the precoding matrices also have a similar tensor structure, however they are defined in a different way because they are defined by the transport stream of the selected rank-oriented UE.

[0009] In terms of space, there are a total of = One CSI port, depending on the CSI-RS precoding configuration: .

[0010] and Indicates: the number of columns and rows of the CSI ports, which defines the horizontal and vertical domains of the 2D CSI antenna port structure; and the coefficient "2" because two antenna polarizations are considered (typically for MIMO arrays). tilt); (Sometimes also written as) () represents the number of subbands in the frequency range, which consists of multiple average PRBs in each.

[0011] Each subband has an associated spatial precoding vector, which is of size [value missing] for each rank layer. .

[0012] After compression, such as Figure 7 As shown, it can be observed that the resulting CSI report consists of a smaller structure with a set of coefficients, which are composed of... Each beam projection and each beam projection in each rank layer Defined by a delayed tap.

[0013] The new CSI structure, represented in the beam-time delay domain, utilizes the sparsity of the channel / precoding matrix after performing corresponding transformations on the respective codebooks for each domain.

[0014] The codebook used allows the raw CSI information obtained from the eigenvector-based precoding matrix to be decomposed into a reduced set of Fourier projections, and then the principal components in the beam and delay domains are determined.

[0015] A set of projection coefficients in quantized form, any associated reference CSI values, and indices of selected components from one or more reference codebooks are collectively referred to as the precoding matrix indicator (PMI).

[0016] CSI includes not only PMI information, but also: information on the rank achievable by the precoding matrix in the form of rank indicators (RI); a set of one or more channel quality indicators (CQI) are also reported, thus providing information about the quality of the transport channels used for their respective UEs, which is based on the signal-to-noise ratio (SNR) estimate of the effective (beamforming) channels.

[0017] Figure 8 The codebook structure is illustrated schematically, and the structure of the Type II codebook of version 15 / 16 is shown in detail.

[0018] exist Figure 8 The diagram illustrates the structure of the Type II codebook for version 15 and the Enhanced Type II codebook for version 16, and demonstrates how to perform PMI calculations. Due to the higher CSI accuracy of Type II, it is commonly used in MU-MIMO applications, as the more reliable CSI is highly beneficial for interference cancellation during scheduling.

[0019] A major difference between Version 15 and Type II is that Version 15 Type II only has features for all average subbands. The ability to spatially compress in beam projection, while version 16 enhanced Type II codebooks include frequency compression, and CSI characterization can be further reduced to the reduced number of delay taps per rank layer.

[0020] By selecting multiple common values ​​for both polarizations and all rank layers. A DFT broadband beam is used to perform beam compression, by a matrix Representation. Matrix Having a size of A block-diagonal structure of complex coefficients, obtained from a larger 2D-DFT oversampled codebook, wherein the oversampled coefficients are... and .

[0021] The unquantized eigenvector-based precoding matrix is ​​to be represented in a set of beam projection coefficients. middle.

[0022] For version 15 type II, The size corresponds to Each complex coefficient represents a linear combination approximation of the precoding matrix used in version 15 type II (i.e., ...). The complete expression for ) is given by the rank layer. Provided.

[0023] On the other hand, for version 16 enhanced type II, the frequency information of the number of sub-bands can be further represented by multiplying by the second frequency codebook to reduce the number of taps, where the reduction is... The number of taps varies from size to... of This indicates that it contains the DFT codeword selected after the frequency transformation.

[0024] The space-frequency linear combination approximation for the precoding matrix used in version 16 enhanced type II (i.e.) ),Depend on Given, among which Represents the Hermitian of a matrix (i.e., the transpose and conjugate of a complex matrix).

[0025] The main advantage of spatial-frequency compression over spatial compression, compared to the spatial-only compression of Type II version 15, lies in the further reduction of the number of coefficients. This allows for several advantages of Enhanced Type II version 16 over Type II version 15: First, due to bit overhead limitations, Type II version 15 first quantizes based on wideband coefficients and then performs 1-bit quantization on the amplitude of each subband, resulting in very coarse quantization. In this respect, Enhanced Type II version 16 can afford better quantization of the amplitude and phase of the beam delay coefficients due to fewer reported coefficients. Second, even with coarse quantization, Type II version 15 still has a large bit overhead budget and may only report at most rank 2. In contrast, with the support of coefficient sparsity, Enhanced Type II version 16 may report at most rank 4, thus giving a fairly moderate total bit overhead.

[0026] On the other hand, the Type I precoder of version 15 has a simpler design but lower CSI accuracy, and it is generally used in SU-MIMO applications where interference is less of a critical issue.

[0027] The concept of the Type I precoder in version 15 is an extension of the traditional LTE codebook, in which a single DFT beam has a fixed amplitude and cross-polarization coefficient (also known as co-phase between two polarizations), and a single DFT beam is sufficient to represent PMI.

[0028] Similar to Type II, codebooks for space can have... and The value is configured in 2D. Furthermore, there are two modes: Mode 1 and Mode 2. In Mode 1, only one beam can be used for the entire frequency band, i.e., L=1. On the other hand, in Mode 2, a set of L=4 beams from the same group are selected, and beam selection for each subband can be accomplished by selecting only one of those L=4 beams.

[0029] Figure 9 The beam selection mechanism is illustrated schematically, and a comparison of the beam selection mechanisms of Version 15 Type I and Version 15 / 16 Type II is shown in detail.

[0030] exist Figure 9 In this study, the beam selection mechanisms of Type I codebook and Type II codebook are compared.

[0031] On the left, for version 15 type I mode 2, it can be observed that the precoder... A group A single beam in Composition, which corresponds to the long-term component In this case, as a short-term component Act as a selector to select the same polarization for two polarizations. The two polarizations have a combination of The QPSK in-phase coefficients are given. Therefore, it is clear that for mode 2, although... Include Each beam, but each time for each sub-band associated with a beam. Select only one beam.

[0032] On the other hand, for version 15 / 16 type II, it can be noted that a structure also exists. However, in this case It is by The given complex coefficients constitute the precoder. It is defined by a linear combination, where each polarization of the precoder matrix is ​​defined by... Given, among which and .

[0033] In this context, it is easy to understand that although Type I and Type II may initially appear to be two different schemes, they maintain some common but different restricted CSI configuration parameters, and are essentially mathematically identical.

[0034] In fact, the main difference is and The structure and quantization. For example, for version 15 type I mode 2, the coefficients... It is only by more general expressions The inclusion of special cases allows for more variable amplitude and phase value definitions due to finer-grained quantization.

[0035] In addition, for the CSI enhancement of version 18, the 3GPP industry has introduced a new CSI quantity.

[0036] This new CSI quantity is called the Time-Domain Channel Attribute (TDCP) indicator, and its function focuses on providing new CSI information to the BS radio physical interface. This CSI information relates to the relative mobility of the UE and the Doppler characteristics associated with the link to the serving BS. This indicator is useful for specific reconfiguration use cases such as CSI codebook type switching and reference signal reconfiguration (e.g., SRS).

[0037] The Doppler spectrum is defined as the Fourier transform of the channel's time correlation function. Let... For subcarriers and time The TRS channel measured at the location, where , It is the time interval between two consecutive TRS measurements. Assume the UE is in time... proceed at the place Such a TRS measurement is then determined by The lag is given and described by Equations 1 and 2. The normalized broadband time correlation function at the location, this function for Averaging of each subcarrier.

[0038] Figure 10 The time-related calculation of TDCP is illustrated schematically, and the calculation process is shown in detail.

[0039]

[0040] The number of lags and their correlation coefficients have been defined as follows.

[0041] 1) For cases where the delay is ≤ Dbasic symbols, choose the number of lags. As a default feature, only the broadband quantization normalization magnitude is reported.

[0042] 2) Optional features for cases where the delay is greater than Dbasic symbols ,as well as For each delay, report the broadband quantization normalization magnitude and (optionally) report the phase.

[0043] Currently, the TDCP value can be used to calculate one or more time-related values. For example, for codebook switching between Type I and Type II codebooks, only one coefficient is needed to determine whether the TDCP is above or below a threshold. This makes switching between the two codebooks possible. In use cases of switching between Type I and Type II codebooks: a) For And the delay is 1ms, with a preferred threshold of 0.992; b) for Y=1 and the delay is 5ms, with a preferred threshold of 0.98; c) for And the delay is 20 ms, with a preferred threshold of 0.92; d) For The delay is 1 ms, and the preferred threshold is 0.995.

[0044] As the quantization scheme degrades, this could result in a performance degradation of up to 12% for average throughput. Figure 11 An example of link-level simulation for Type I / Type II codebook switching with TDCP-based thresholding is provided. Different quantization schemes are used in this example.

[0045] Figure 11It is a graph comparing the results of codebook switching with different TDCP configuration schemes, and specifically shows examples of Type I / Type II codebook switching with different TDCP quantization schemes.

[0046] Currently, for reconfigurable CSI, it depends on codebook switching or reconfiguration of a single CSI parameter (e.g., CSI-RS cycle). While the introduction of TDCP is an important step forward, it is insufficient and the CSI feedback process can be further improved through a more comprehensive perspective of generalized CSI codebook reconfiguration, which includes all the different characteristics and parameters associated with CSI.

[0047] As mentioned earlier, while information obtained from TDCP is helpful for decision-making, it should not be used in isolation from other CSI segments (e.g., Precoding Matrix Indicator (PMI), Rank Indicator (RI), and Channel Quality Indicator (CQI)). The latter are important for optimizing the performance of the entire CSI feedback process.

[0048] For example, the following was observed during simulation for different UE mobility configurations regarding the functionality of Type I codebook and Type II codebook.

[0049] A larger number of beams at higher rates does not necessarily provide better performance. This can be deduced by simply understanding that Type I architecture contains one beam per subband while Type II has four beams per subband. From a linear combination perspective, in high mobility scenarios, only the most dominant beam is reliable.

[0050] Similarly, higher subband granularity at higher speeds does not necessarily provide significantly better performance because frequency selectivity becomes quite unreliable. Wideband CSI can produce almost the same performance with a significant reduction in bit overhead.

[0051] - For the highest rank, CSI information in different rank levels degrades more rapidly. Therefore, the reported RI cannot be entirely reliable because the highest rank CSI degrades over time, thus misleading the BS regarding the possibility that the UE supports high-rank transmission.

[0052] Furthermore, under CSI aging, if only the high-amplitude spatial-frequency tap components are used as the sole robust information, the granularity quantization of the coefficients becomes less reliable. This may also lead to the need to disable frequency compression and adjust the quantization scheme and the number of subbands.

[0053] -CSI aging can be compensated for by CSI prediction. However, CSI prediction is not always entirely effective because certain conditions need to be met in order to estimate the prediction coefficients used for channel CSI extrapolation. For example, if the channel coherence time is particularly narrow due to increased Doppler spread (i.e., at higher speeds), the CSI-RS period should be reconfigured to have a sufficient sampling rate to track channel variations. TDCP can be used, for example, to estimate the required CSI-RS period, a well-known potential use of this function. However, in cases where the required reference signal period cannot be set in response to channel variability (e.g., network resource constraints), CSI prediction can be deactivated and the bit overhead reconfigured.

[0054] Furthermore, compared to a simple switch between two alternatives (e.g., on / off), the aforementioned CSI characteristics can have more than one state configuration. Therefore, the number of beams, subbands, reported CSI coefficients, maximum reportable rank, quantization characteristics, etc., can be set to better operating points, depending on mobility or channel quality conditions.

[0055] Therefore, the need arose for more flexible and robust configurations for CSI reporting.

[0056] Therefore, flexible channel state information configuration is required. Summary of the Invention

[0057] Various example embodiments are intended to address at least some of the problems and / or difficulties and disadvantages described above.

[0058] Various aspects of the exemplary embodiments are set forth in the appended claims.

[0059] According to an exemplary aspect, a method for an access network entity is provided, the method comprising: receiving from a terminal radio channel quality report configuration feedback information established based on at least one reference signal; generating a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is present; and sending to the terminal information indicating the modified radio channel quality report configuration for the terminal.

[0060] According to an exemplary aspect, a method for providing a terminal is provided, the method comprising: sending radio channel quality report configuration feedback information established based on at least one reference signal to an access network entity; receiving from the access network entity information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from an initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is present; and determining the modified radio channel quality report configuration for the terminal based on the information indicating the modified radio channel quality report configuration for the terminal.

[0061] According to an exemplary aspect, an apparatus for an access network entity is provided, the apparatus comprising: a receiving circuitry system configured to: receive radio channel quality report configuration feedback information established based on at least one reference signal from a terminal; a generating circuitry system configured to: generate a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is specified; and a transmitting circuitry system configured to: transmit information indicating the modified radio channel quality report configuration for the terminal to the terminal.

[0062] According to an exemplary aspect, an apparatus for a terminal is provided, the apparatus comprising: a transmitting circuitry configured to: transmit radio channel quality report configuration feedback information established based on at least one reference signal to an access network entity; a receiving circuitry configured to: receive from the access network entity information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from an initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is present; and a determining circuitry configured to: determine the modified radio channel quality report configuration for the terminal based on the information indicating the modified radio channel quality report configuration for the terminal.

[0063] According to an exemplary aspect, an apparatus for an access network entity is provided, the apparatus comprising: at least one processor; and at least one memory storing instructions, which, when executed by the at least one processor, cause the apparatus to at least: receive radio channel quality report configuration feedback information established based on at least one reference signal from a terminal; generate a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that it contains at least one report configuration parameter; and send information to the terminal indicating the modified radio channel quality report configuration for the terminal.

[0064] According to an exemplary aspect, an apparatus for a terminal is provided, the apparatus comprising: at least one processor; and at least one memory storing instructions, which, when executed by the at least one processor, cause the apparatus to at least: send radio channel quality report configuration feedback information established based on at least one reference signal to an access network entity; receive from the access network entity information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from an initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is used; and determine the modified radio channel quality report configuration for the terminal based on the information indicating the modified radio channel quality report configuration for the terminal.

[0065] According to an exemplary aspect, a computer program product including computer-executable computer program code is provided, wherein when the program is run on a computer (e.g., a computer of an apparatus according to any of the foregoing apparatus-related examples of the present disclosure), the computer-executable computer program code is configured to cause the computer to perform a method according to any of the foregoing method-related examples of the present disclosure.

[0066] Such computer program products may include (or be embodied in) a (tangible) computer-readable (storage) medium on which computer-executable computer program code is stored, and / or the program may be directly loaded into the computer’s internal memory or its processor.

[0067] Any of the above aspects can effectively provide and utilize a reporting process based on a unified CSI feedback codebook, thereby addressing at least some of the problems and shortcomings identified in the prior art.

[0068] As an example embodiment, flexible channel state information configuration is provided. More specifically, through example embodiments, measures and mechanisms for implementing flexible channel state information configuration are provided.

[0069] Therefore, improvements are achieved by enabling / implementing methods, apparatuses, and computer program products for flexible channel state information configuration. Attached Figure Description

[0070] In the following, this disclosure will be described in more detail by way of non-limiting example with reference to the accompanying drawings, in which... Figure 1 This is a block diagram illustrating an apparatus according to an example embodiment. Figure 2 This is a block diagram illustrating an apparatus according to an example embodiment. Figure 3 This is a block diagram illustrating an apparatus according to an example embodiment. Figure 4 This is a block diagram illustrating an apparatus according to an example embodiment. Figure 5 This is a schematic diagram of a process according to an example embodiment. Figure 6 This is a schematic diagram of a process according to an example embodiment. Figure 7 The channel characterization is illustrated schematically. Figure 8 The codebook structure is illustrated schematically. Figure 9 The beam selection mechanism is illustrated schematically. Figure 10 The time-related calculations used for TDCP are illustrated schematically. Figure 11 This is a graph comparing the results of codebook switching with different TDCP schemes. Figure 12 This is an illustrative representation of the unified codebook based on the example embodiments. Figure 13 This is a schematic diagram of a process according to an example embodiment. Figure 14 The reconfiguration of the tree structure codebook according to the example embodiment is illustrated schematically. Figure 15 The codebase reconfiguration based on a machine learning model according to an example embodiment is illustrated schematically. Figure 16 The diagram schematically illustrates CSI aging at different channel layers. Figure 17 ( Figure 17a and Figure 17b The diagram shown illustrates the CSI degradation. Figure 18aThis is a schematic diagram of a process according to an example embodiment. Figure 18b This is a schematic diagram of a process according to an example embodiment. Figure 19 ( Figure 19a and Figure 19b The diagram shows the CSI after different types of CSI compression were performed to generate the CSI report. Figure 20 This is a schematic diagram of a process according to an example embodiment. Figure 21 This is a graph comparing the results of different CSI feedback codebook configurations according to the example embodiment. Figure 22 A diagram is shown illustrating the results of different CSI feedback codebook configurations according to an example embodiment. Figure 23 A diagram is shown illustrating the results of different CSI feedback codebook configurations according to an example embodiment. Figure 24 This is a table showing examples of codebook parameterization in the multi-rank case where RI and TDCP are used as the primary configuration selectors, and... Figure 25 A block diagram of an apparatus according to an example embodiment is shown alternatively. Detailed Implementation

[0071] This disclosure is described herein with reference to specific, non-limiting examples and embodiments that are currently considered conceivable. Those skilled in the art will understand that this disclosure is by no means limited to these examples and can be applied more broadly.

[0072] It should be noted that the following description of this disclosure and its embodiments primarily refers to specifications used as non-limiting examples of certain exemplary network configurations and deployments. That is, this disclosure and its embodiments are described primarily with respect to 3GPP specifications used as non-limiting examples of certain exemplary network configurations and deployments. Therefore, the description of the exemplary embodiments given herein specifically refers to terms directly related to them. Such terms are used only in the context of the presented non-limiting examples and naturally do not limit this disclosure in any way. Conversely, any other communication or communication-related system deployments, etc., may be utilized as long as they conform to the features described herein.

[0073] In the following description, various embodiments and implementations of this disclosure and one or more aspects thereof are described using several variations and / or alternatives. It should be noted that, depending on certain needs and constraints, all described variations and / or alternatives may be provided individually or in any conceivable combination (including combinations of features of various variations and / or alternatives).

[0074] As used herein, for at least one of the following: and , and for similar wording, the inclusion of a list of two or more elements connected by "and" or "or" means at least any one of the elements, or at least any two or more of the elements, or at least all of the elements.

[0075] According to example embodiments, measures and mechanisms are generally provided for (enabling / implementing) flexible channel state information configuration.

[0076] As mentioned above, the latest relevant version 18 CSI enhancements introduce two new types of codebook extensions. One type of codebook extension is the CJT case, which is an extension of the legacy version 16 for multiple TRPs, still using spatial-frequency compression; and the Doppler codebook extension, which uses prediction and time-Doppler domain compression (on top of spatial-frequency compression) to address CSI aging issues at a higher speed.

[0077] Subsequently, the focus is on further enhancements and flexibility in reporting based on Type II space-frequency CSI codebooks; however, to some extent, the following also covers CSI predictions.

[0078] In this sense, for high mobility, CSI reconfiguration can still be completed without any CSI aging compensation (i.e., without CSI forecasting) simply to optimize the resources used in reporting.

[0079] In particular, the bit overhead and other characteristics of defining a CSI codebook-based reporting scheme are addressed below.

[0080] However, this may also mean that the input reference signal used for the CSI feedback process needs to be reconfigured accordingly. Therefore, this disclosure also focuses on the gain-cost ratio of the CSI feedback setup, with particular emphasis on mobility awareness. In other words, it is important to avoid over-configuration if further gain cannot be provided for a given scenario with specific mobility characteristics. The example embodiments enable the selection of the simplest and most resource-efficient CSI feedback setup and the use of customized configurations.

[0081] A simple switch between two different codebooks (i.e., Type I / Type II) offers some technical advantages, as Type I may perform better than Type II at high speeds while using resources more efficiently (i.e., less bit overhead and computational complexity). However, this approach remains suboptimal. Reported reconfiguration based on the CSI codebook, with settings tailored to different CSI parameterizations for UE transmission conditions, should be able to provide more gradual changes, especially under high mobility conditions.

[0082] According to the example implementation, a coordination framework can be created to build a standardized reconfiguration model for CSI based on given inputs from TDCP, RI, PMI, CQI, and other potential new CSI quantities, wherein 1) multiple parameters of the codebook based on CSI feedback can be jointly and dynamically reconfigured by receiving a specific set of CSI inputs, and 2) there is no need to switch between different types (i.e., type I / II) of codebooks, or to implement multiple chipset implementations of different existing CSI schemes.

[0083] Essentially, regardless of the codebook used, CSI inputs are based on the same mathematical and physical foundations, and common parameters can be reconfigured. As currently defined, the current codebook type definition imposes specific fixed quantization, beam selection, and frequency information reporting schemes, and typically also imposes limitations on configurable characteristics. However, given that CSI codebook limitations are merely arbitrarily defined by the standard, CSI process characteristics can be harmoniously integrated into a single, seamless, reconfigurable "unified CSI feedback codebook reporting process," which features customizable, wide-ranging CSI parameterization definitions, such as... Figure 12 As shown.

[0084] Figure 12 This is a schematic representation of a unified codebook according to an example embodiment, and specifically illustrates a codebook based on unified CSI feedback as a combination of types of codebooks based on arbitrary restricted CSI feedback.

[0085] Therefore, in short, according to the example embodiment, information contained in the CSI report, including at least one piece of RI and TDCP information, wherein PMI, CQI, and / or any additional indicators embedded in the CSI report obtained from the UE, are used as input to perform CSI codebook-based report reconfiguration. To achieve this, additional signals besides CSI-RS, such as TRS and SRS, may be required. Furthermore, according to the example embodiment, a unified CSI feedback codebook definition is provided using one or more sets of CSI configuration parameters.

[0086] According to an example embodiment, this set of one or more reconfigurable parameters may include, - Rank restrictions on the rank indicator (RI) - Type of CSI calculation: port selection and / or predefined codebook (e.g., DFT). - Number of spatial beams (L) - Number of delayed taps (M) - Quantization settings for CSI coefficients -Broadband or subband reporting settings - Frequency compression activation or deactivation, and / or -CSI predicts activation or deactivation.

[0087] Furthermore, according to the example embodiment, CSI-RS, TRS, and / or SRS parameter configurations can be provided, including: - Cell / group / UE-specific RS allocation - Non-periodic / periodic RS configuration, and / or - The number of RS sets.

[0088] For reports based on the CSI codebook, RS configuration is necessary. However, in many cases, due to network resource constraints, fixing it may also be considered.

[0089] The example implementation will be described in more detail below.

[0090] Figure 1 This is a block diagram illustrating an apparatus according to an example embodiment. The apparatus may be an access network node or entity 10, such as a gNB or multiple TRPs, and includes a receiving circuitry system 11, a generating circuitry system 12, and a transmitting circuitry system 13. The receiving circuitry system 11 receives radio channel quality report configuration feedback information established based on at least one reference signal from a terminal. The generating circuitry system 12 generates a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information. The modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is specified. The transmitting circuitry system 13 transmits information to the terminal indicating the modified radio channel quality report configuration for the terminal. Figure 5 This is a schematic diagram of a process according to an example embodiment. According to Figure 1 The device can perform Figure 5 The method, but not limited to this method. Figure 5 The method can be derived from Figure 1 The device performs the action, but is not limited to the device performing the action.

[0091] like Figure 5As shown, the process according to the example embodiment includes: receiving radio channel quality report configuration feedback information established based on at least one reference signal from a terminal (S51); generating a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is used (S52); and sending information indicating the modified radio channel quality report configuration for the terminal to the terminal (S53).

[0092] According to an example embodiment, the channel quality report configuration may include, for example, report configuration parameters. In this regard, mobility and rank conditions can be considered as key characteristics for defining the (reconfiguration) of the channel state information codebook.

[0093] Figure 2 This is a block diagram illustrating an apparatus according to an example embodiment. Specifically, Figure 2 It shows Figure 1 A variant of the device shown. Therefore, according to Figure 2 The device may also include a reference circuit system 21 and / or a consideration circuit system 22.

[0094] In an embodiment, Figure 1 (or Figure 2 At least a portion of the functionality of the apparatus shown can be shared between two physically separate devices forming an operational entity. Therefore, the apparatus can be viewed as an operational entity depicting one or more physically separate devices comprising at least some of the processes described in the process.

[0095] according to Figure 5 Variations of the illustrated process provide exemplary additional operations, which are independent of each other. According to such a variation, an exemplary method according to an example embodiment may include: generating an initial radio channel quality report configuration for the terminal based on the terminal's radio channel quality reporting capability, the initial radio channel quality report configuration for the terminal including at least one report configuration parameter; sending information to the terminal indicating the initial radio channel quality report configuration for the terminal; and sending the at least one reference signal.

[0096] according to Figure 5Variations of the illustrated process provide exemplary additional operations, which are independent of each other. According to such a variation, an exemplary method based on an example embodiment may include receiving information from the terminal regarding the terminal's radio channel quality reporting capability.

[0097] According to a further example embodiment, the radio channel quality reporting capability of the terminal includes at least one of the following: the terminal's spatial compression support capability, or the terminal's subband / wideband reporting capability, or the terminal's frequency compression support capability, or the terminal's time prediction support capability, or the terminal's time compression support capability, or the terminal's quantization capability.

[0098] According to a further example embodiment, the radio channel quality report configuration feedback information includes at least one of the following: information included in the channel state information report, or a reference signal sent by at least one terminal.

[0099] According to a further example embodiment, the information included in the channel state information report includes at least one of the following: rank indicator value, or a set of time-domain channel attribute values, or a set of precoding matrix indicators, or a set of channel quality indicator values.

[0100] According to a further example embodiment, the information indicating the modified radio channel quality report configuration includes at least one of the following: information about rank limits on the rank indicator, or information about the type of channel state information calculation, or information about the number of spatial beams, or information about the number of delay taps, or information about the quantization settings of the channel state information coefficients, or information about the broadband or subband reporting settings, or information about frequency compression activation or deactivation, or information about channel state information prediction activation or deactivation, or information about the reference signal configuration.

[0101] according to Figure 5 The variations of the process shown provide exemplary details of a generation operation (generating the modified radio channel quality report configuration for the terminal), these exemplary details being independent of each other. Such an exemplary generation operation (generating the modified radio channel quality report configuration for the terminal) according to an example embodiment may include referencing at least one stored table containing radio channel quality report configuration definitions. The information indicating the modified radio channel quality report configuration includes at least one of the following: a set of indexes to the modified radio channel quality report configuration in the at least one stored table, or at least one report configuration parameter different from the initial radio channel quality report configuration for the terminal.

[0102] according to Figure 5 The variations of the process shown provide exemplary additional operations and details for the generation operation (generating the modified radio channel quality report configuration for the terminal), which are independent of each other. According to this variation, the exemplary method according to the example embodiment may include receiving information from the terminal regarding at least one suggested report configuration parameter to be modified. Furthermore, this exemplary generation operation (generating the modified radio channel quality report configuration for the terminal) according to the example embodiment may include taking into account the at least one suggested report configuration parameter to be modified when generating the modified radio channel quality report configuration for the terminal.

[0103] Therefore, the network entity can receive UE capabilities from the UE, send a set of reference signals (CSI-RS and / or TRS or any other RS) and an initial CSI configuration to perform the CSI feedback process; receive reference signaling and / or at least mobility and / or rank condition CSI indications from the UE based at least in part on the sent reference signals; determine a new CSI configuration based on the reference signaling and / or CSI indications received from the UE; and send the new configuration settings to the UE.

[0104] UE capabilities may include spatial compression support capabilities, subband / wideband reporting capabilities, frequency compression support capabilities, time prediction and / or time compression support capabilities, and / or quantization capabilities.

[0105] Receiving reference signaling and / or CSI indications from the UE, at least in part, based on the transmitted reference signals, may include: receiving a CSI report at a network entity, the process of which includes at least obtaining a set of RI values ​​and TDCP values, and / or including PMI values, CQI values, and / or receiving any other additional types of CSI indications embedded in the CSI report, and / or receiving a set of reference signals (e.g., probe reference signals, SRS, or any set of reference signals transmitted by the UE).

[0106] When a new CSI parameter configuration update is sent, the CSI codebook-based reporting parameters that can be reconfigured are at least one of the following: rank limit for the rank indicator (RI), type of CSI calculation: port selection and / or predefined codebook (e.g., DFT), number of spatial beams (L), number of delay taps (M), quantization settings for CSI coefficients, wideband or subband reporting settings, frequency compression activation or deactivation, and / or CSI prediction activation or deactivation.

[0107] When a new CSI parameter configuration update is sent, the reference signal (CSI-RS, TRS, and / or SRS) parameters that can be reconfigured are at least one of the following: cell / group / UE-specific RS allocation, non-periodic / periodic RS configuration, and / or the number of RS sets.

[0108] A new CSI configuration can be determined based on one or more fixed configuration tables. The network can send an index (or a set of indexes) to indicate the determined configuration, or it can add several new reconfigured CSI parameters to the control message. This mechanism for searching CSI configurations in configuration rule tables can be based on decision trees, artificial intelligence (AI) / machine learning (ML), or any other type of implementation.

[0109] For CSI from a (variable speed) UE, according to the example embodiment, the TDCP value and RI value (master parameters) are used together with other parameters (e.g., PMI, CQI) to determine a new setting in a set of one or more CSI configuration parameters. Alternatively, in the absence of TDCP information, according to the example embodiment, measurements of the SRS are used to calculate time-related information in place of the TDCP information.

[0110] Figure 3 This is a block diagram illustrating an apparatus according to an example embodiment. The apparatus may be a terminal 30, such as a UE, and includes a transmitting circuitry system 31, a receiving circuitry system 32, and a determining circuitry system 33. The transmitting circuitry system 31 transmits radio channel quality report configuration feedback information established based on at least one reference signal to an access network entity. The receiving circuitry system 32 receives from the access network entity information indicating a modified radio channel quality report configuration for the terminal, the modified configuration differing from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is specified. The determining circuitry system 33 determines the modified radio channel quality report configuration for the terminal based on the information indicating the modified configuration. Figure 6 This is a schematic diagram of a process according to an example embodiment. According to Figure 3 The device can perform Figure 6 The method, but not limited to this method. Figure 6 The method can be derived from Figure 3 The device performs the action, but is not limited to the device performing the action.

[0111] like Figure 6As shown, the process according to the example embodiment includes: sending (S61) radio channel quality report configuration feedback information established based on at least one reference signal to an access network entity; receiving (S62) information indicating a modified radio channel quality report configuration for the terminal from the access network entity, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is used; and determining (S63) the modified radio channel quality report configuration for the terminal based on the information indicating the modified radio channel quality report configuration for the terminal.

[0112] According to the example embodiment, the channel quality report configuration may include, for example, report configuration parameters. In this regard, mobility and rank conditions can be considered as the main characteristics used to define the (re)configuration of the channel state information codebook.

[0113] Figure 4 This is a block diagram illustrating an apparatus according to an example embodiment. Specifically, Figure 4 It shows Figure 3 A variant of the device shown. Therefore, according to Figure 4 The device may also include a generation circuit system 41.

[0114] In an embodiment, Figure 3 (or Figure 4 At least some functions of the apparatus shown can be shared between two physically separate devices that form an operational entity. Therefore, the apparatus can be viewed as an operational entity that depicts one or more physically separate devices including those for performing at least some of the processes described in the process.

[0115] according to Figure 6 Variations of the illustrated process provide exemplary additional operations, which are independent of each other. According to such a variation, an exemplary method according to an example embodiment may include the following operations: receiving from the access network entity information indicating the initial radio channel quality report configuration for the terminal, the initial radio channel quality report configuration for the terminal including at least one report configuration parameter; receiving the at least one reference signal; and generating radio channel quality report configuration feedback information based on the at least one reference signal and the initial radio channel quality report configuration for the terminal.

[0116] according to Figure 6 Variations of the illustrated process provide exemplary additional operations, which are independent of each other. According to such a variation, an exemplary method based on an example embodiment may include sending information to the access network entity regarding the terminal's radio channel quality reporting capabilities.

[0117] According to a further example embodiment, the radio channel quality reporting capability of the terminal includes at least one of the following: the terminal's spatial compression support capability, or the terminal's subband / wideband reporting capability, or the terminal's frequency compression support capability, or the terminal's time prediction support capability, or the terminal's time compression support capability, or the terminal's quantization capability.

[0118] According to a further example embodiment, the radio channel quality report configuration feedback information includes at least one of the following: information included in the channel state information report, or a reference signal sent by at least one terminal.

[0119] According to a further example embodiment, the information included in the channel state information report includes at least one of the following: rank indicator value, or a set of time-domain channel attribute values, or a set of precoding matrix indicators, or a set of channel quality indicator values.

[0120] According to a further example embodiment, the information indicating the modified radio channel quality report configuration includes at least one of the following: information about rank limits on the rank indicator, or information about the type of channel state information calculation, or information about the number of spatial beams, or information about the number of delay taps, or information about the quantization settings of the channel state information coefficients, or information about the broadband or subband reporting settings, or information about frequency compression activation or deactivation, or information about channel state information prediction activation or deactivation, or information about the reference signal configuration.

[0121] According to a further example embodiment, the information indicating the modified radio channel quality report configuration includes at least one of the following: a set of indexes to the modified radio channel quality report configuration in at least one stored table, the at least one stored table including radio channel quality report configuration definitions, or at least one report configuration parameter different from the initial radio channel quality report configuration used for the terminal.

[0122] according to Figure 6 Variations of the illustrated process provide exemplary additional operations, which are independent of each other. According to such variations, an exemplary method based on an example embodiment may include: determining at least one proposed reporting configuration parameter to be modified based on observed radio channel quality behavior, and sending information about the at least one proposed reporting configuration parameter to be modified to the access network entity.

[0123] According to the example embodiment, the key points for quantifying the observed radio channel quality behavior are mobility conditions and channel rank.

[0124] Therefore, a user equipment can send / indicate UE capabilities to a network entity (e.g., composed of one or more gNB / TRPs), receive a set of reference signals (CSI-RS and / or TRS or any other RS) and an initial CSI configuration from the network entity to perform a CSI feedback process, calculate CSI based on measurements of CSI-RS and / or TRS to provide at least information on UE mobility and / or rank conditions, send reference signaling and / or CSI indications to the network entity at least in part based on the initial CSI configuration and the calculated CSI, and, in response, receive new CSI configuration parameterization updates from the network entity based on previously sent reference signaling and / or CSI indications sent from the UE to the network entity.

[0125] The UE capabilities that can be transmitted / indicated may include spatial compression support capabilities, subband / wideband reporting capabilities, frequency compression support capabilities, time prediction and / or time compression support capabilities and / or quantization capabilities.

[0126] Sending reference signaling and / or CSI indications to a network entity based at least in part on the calculated CSI may include: sending a CSI report to the network entity, which includes at least obtaining a set of RI values ​​and TDCP values, and / or including PMI values, CQI values, and / or receiving any other additional types of CSI indications embedded in the CSI report, and / or sending a set of reference signals (e.g., sounding reference signal SRS, or any set of reference signals sent by the UE).

[0127] When a new CSI parameter configuration update is received, the CSI codebook-based reporting parameters that can be reconfigured are at least one of the following: rank limit on the rank indicator (RI), type of CSI calculation, number of spatial beams (L), number of delay taps (M), quantization settings for CSI coefficients, wideband or subband reporting settings, frequency compression activation or deactivation, and / or CSI prediction activation or deactivation. The type of CSI calculation includes: port selection and / or a predefined codebook (e.g., DFT).

[0128] When a new CSI parameter configuration update is received, the reconfigurable reference signal (CSI-RS, TRS, and / or SRS) parameters include at least one of the following: cell / group / UE-specific RS allocation, non-periodic / periodic RS configuration, and / or the number of RS sets.

[0129] The example embodiments outlined and specified above are explained below using more specific terminology.

[0130] To perform a reconfiguration, the UE must provide the network with a CSI report containing TDCP and RI, including PMI, CQI, and RI. However, TDCP may be optional in some cases (depending on the configuration / availability of TRS). According to the example embodiment, the CSI report may include other further metrics or indicators, which may be advantageous for performing such a reconfiguration.

[0131] In addition to CSI reports, probe reference signals (SRS) transmitted from the UE can also provide useful information for performing such reconfiguration. For example, in the absence of TRS-based TDCP functionality, SRS information can be useful for calculating time-related information.

[0132] Whether using TDCP based on TRS or SRS, reconfiguration can be performed based on mobility conditions.

[0133] Other additional indicators (such as CQI) can also be used to describe the relative link status between the UE and gNB based on the SNR level.

[0134] According to the example embodiment, based on the concept of SNR level, and the concept of other available UE location indicators or channel statistics obtained from the UE, this can be used as an indication of the type of primary channel condition, such as LOS, NLOS. Furthermore, the beam configuration reported by CSI can be applied accordingly to UEs located at the cell center or edge.

[0135] Other CSI-supported features can also be reconfigured. For example, features related to downlink-side reference signals (i.e., TRS or CSI-RS) or uplink-side reference signals (i.e., SRS) can be customized to meet measurement needs. For instance, these signals may need to be reconfigured for cell-, group-, or UE-specific precoding. For example, for port selection, a CSI group- or UE-specific CSI-RS is required; while for DFT codebook CSI, the optimal choice is a cell-specific set of CSI-RS.

[0136] Furthermore, for periodic signals, it may be necessary to reconfigure the time period, or to add auxiliary sets of periodic and / or non-periodic signals to perform joint measurements. Although this is not part of the CSI codebook-based reporting configuration itself, it is a necessary process to support CSI measurements that enable CSI reporting.

[0137] According to the example embodiment, the CSI reporting and support features described above are at least partially reconfigured.

[0138] According to the example embodiment, in response to the received CSI indicator, the network provides a report reconfiguration based on the CSI codebook based on the following respective inputs: RI value and / or TDCP value along with PMI / CQI, and / or processed metric obtained from SRS, and / or any other useful indicator or metric reported by the UE.

[0139] According to an alternative example embodiment, instead of using an index from a fixed table, the network responds in a configuration message with one or more CSI configuration parameter values ​​to be updated. The information used to recover from CSI reports or SRS measurements can be historically averaged, or instantaneous values ​​can be used on the network side.

[0140] Based on the discussion presented above, in Figure 13 The document provides a basic block diagram indicating the inputs and outputs that guide the interaction between the UE and network entities.

[0141] Figure 13 It is a schematic diagram of the process according to an example embodiment, and specifically shows the inputs and outputs that instruct the UE to interact with network entities to perform a report reconfiguration based on the CSI codebook.

[0142] On the other hand, as already mentioned, CSI inputs (RI, TDCP, PMI, CQI, or any other) provide the information needed to reconfigure all parameters of a process based on the CSI feedback codebook.

[0143] The simplest case is represented by a finite number of combinations of each parameter, some of which can have a higher level, and then the network has the ability to reduce to multiple possible reconfiguration choices of lower-level parameters.

[0144] According to the example embodiment, this process can be simply performed as a selection tree, such as... Figure 14 As shown.

[0145] Figure 14 The tree structure codebook reconfiguration according to the example embodiment is illustrated schematically, and specifically a non-full-grid tree structure for CSI-based codebook reconfiguration is shown.

[0146] In the standard definition, a set of one or more tables can be defined using different mappings from CSI inputs to corresponding CSI reconfigurable parameter values. Tables can be linked together, and each table covers only a subset of the parameters. This avoids the problem of excessively large tables due to listing all combinations. Furthermore, the UE can be equipped with other types of signaling and / or indications to supplement the information available from TDCP, RI, PMI, and CQI.

[0147] When using a selection tree for codebook configuration (e.g.) Figure 14 As shown, if the UE capabilities are first notified to the network entity, a default configuration can be proposed based on the UE characteristics. Such an initial configuration then allows the CSI process to be trained to understand which features to disable or keep enabled, and allows for re-evaluation of CSI parameterization after a learning window of one or more CSI reports.

[0148] Most likely, the higher levels of the selection tree will be dominated by TDCP and RI selection values ​​in order to more carefully narrow down the configuration based on mobility and rank conditions.

[0149] The selection of CSI inputs required in defining the parameter table may potentially necessitate changes to how CSI quantities PMI, CQI, TDCP, or RI are routinely calculated or reported. For example, this might involve alterations to the quantification scheme or the structure of the reported values ​​to differentiate between different states in the CSI reconfiguration table. While example CSI quantities have been mentioned above, these are not limiting, and any type of CSI quantity can be used as input to a mechanism based on a reconfigurable CSI feedback codebook.

[0150] According to a further example embodiment, the UE can provide explicit information to reconfigure one or more parameters, or suggest reconfiguring one or more indexes of a table and their respective configuration settings.

[0151] This mechanism is useful because the UE has better visibility of channel data before calculating CSI and can detect behavior or provide information that cannot be extracted from traditional CSI quantities such as TDCP, RI, PMI, and CQI.

[0152] For example, a UE can request to increase the number of beams, increase quantization granularity, implement higher-rank reporting, increase the number of subbands, or increase the number of delay taps.

[0153] This is also useful for network entities, as the information in the CSI input may only allow network entities to reconfigure parameters in the opposite sense, to reduce or simplify the CSI structure, for example, from the default initial configuration, to reduce the number of beams, reduce quantization granularity, limit rank, reduce the number of subbands, or the number of reported delay taps.

[0154] In other words, if the UE can suggest increasing the value of a given parameter, it will be useful for more accurate reconfiguration. Nevertheless, these UE suggestions must also be consistent with the reported mobility and rank conditions.

[0155] Therefore, according to the example embodiment, the UE can provide explicit information to reconfigure one or more parameters, or suggest reconfiguring one or more indexes of a table, and their corresponding configuration settings consistent with the reported mobility and rank conditions.

[0156] Compared to previous methods where one set of CSI configuration parameter combinations was not fully meshed and a hierarchical selection tree could be implemented along with a corresponding selection table, a more complex situation can be addressed as follows. This more complex situation might require checking the entire set of combinations using a greedy algorithm or an exhaustive search scheme to find the optimal settings.

[0157] Figure 15 The codebook reconfiguration based on a machine learning model according to an example embodiment is illustrated schematically, and an example of a CSI reconfiguration unit based on an ML model is specifically shown.

[0158] In addition to any other auxiliary information that can help improve the model’s capabilities, ML models can also take reported CSI values ​​(e.g., TDCP, RI, PMI, CQI) as input.

[0159] Subsequently, this information is passed through the cascaded inner blocks (hidden layer 1, ..., hidden layer Nh) based on a neural network (NN). In this case, information only moves from the input block to the output block in the forward direction. The output layer has Ω output parameters corresponding to all CSI reconfiguration indices.

[0160] The available training methods are known to those skilled in the field of ML. In one example, the optimal CSI reconfiguration index (or a set of optimal CSI reconfiguration indices) determined for the UE can be used as labels to train a set of internal blocks with input / output layers using supervised machine learning techniques.

[0161] After training, the ML model is used for inference.

[0162] The UE reports CSI values ​​(TDCP, RI, PMI, CQI, or any other additional indication in CSI), which are used as input to the ML model to predict the optimal CSI reconfiguration ID.

[0163] Because of the ability of ML learning models (such as neural networks) to learn complex or convolutional relationships between their inputs and outputs, ML models deployed to network nodes can provide better reconfiguration performance than other methods (such as decision tree methods), such as in the case of CSI report values ​​and CSI reconfiguration indexes.

[0164] On the other hand, the reconfigurability of the process based on a unified CSI feedback codebook allows for several advantages over traditional solutions with different codebook implementations. First, it offers better customizability based on reported CSI conditions. Second, it provides iterative reconfiguration capabilities, avoiding switching between different codebook implementations with incomplete or inflexible CSI capabilities. Third, if the UE knows the decision logic used by the network, it can anticipate certain specific settings or a set of possible settings to be preloaded in the UE configuration, further reducing handover parameter latency. It can also help detect differences in the provided network configuration.

[0165] The following example illustrates a report reconfiguration process based on the CSI feedback codebook by combining the Rank Indicator (RI) and Time-Domain Channel Attribute (TDCP) indicator. As mentioned earlier, the UE reports the RI in each CSI report. However, CSI information expires after a few milliseconds, and for example... Figure 16 For the higher ranks shown, this demotion is more pronounced.

[0166] Figure 16 CSI aging is schematically illustrated, and CSI aging at different rank levels is specifically shown.

[0167] Because of the latter, the network may make incorrect assumptions about the true transmission rank of a given UE.

[0168] Furthermore, as shown in Figure 17, the problem is exacerbated by the higher speed and the resulting Doppler spread effect.

[0169] Figure 17 ( Figure 17a and Figure 17b The diagram shows the CSI degradation, and specifically shows simulation examples of CSI degradation for arbitrary UEs equipped with 4 Rx antennas at a) 3 km / h and b) 10 km / h and a CSI-RS period of 20 ms.

[0170] As shown in Figure 17, for any UE equipped with four Rx antennas with a CSI-RS period defined as 20 ms at 3 km / h and 10 km / h respectively, the actual situation was observed through simulation to obtain the cosine similarity between the finally reported PMI and each rank level (up to rank 4) of the instantaneous ideal CSI measured per millisecond.

[0171] In the simulation, idealized and unquantized beamforming is used to report the generated PMI. From the two descriptions, it can be noted that although the RI is reported for each CSI cycle, the reliability of this value decreases over time due to CSI aging before the next CSI refresh.

[0172] like Figure 16 As shown, higher layers contribute less to overall spectral efficiency. One solution according to the example embodiment is to combine the information from RI and TDCP to better understand the rank indicator constraint. This means using the reported RI and TDCP to determine whether a rank constraint should be imposed. Therefore, considering this rank constraint on the selection of a set of CSI parameters for the constraint, the rank constraint reduces the parameterization of the feedback report based on the CSI codebook.

[0173] This can be implemented as depicted in Figure 18.

[0174] Figure 18a This is a schematic diagram of the process according to an example embodiment, and specifically shows a simplified timing diagram illustrating how TDCP can be used as a key high-level control variable to select the rank limit mechanism. Furthermore, it shows how a new selection of the rank limit, based on values ​​from PMI and / or CQI, causes further reconfiguration changes to other CSI parameters.

[0175] Figure 18b This is a schematic diagram of the process according to an example embodiment, and specifically shows a detailed sequence diagram illustrating how TDCP is used as a key high-level control variable to select the rank limit mechanism. Furthermore, it shows how a new selection of the rank limit, based on values ​​from PMI and / or CQI, causes further reconfiguration changes to other CSI parameters.

[0176] As shown in Figure 18, the network can send CSI-RS and TRS after providing initial configuration, and obtain one or more CSI reports including RI, TDCP, PMI, and CQI.

[0177] Following one or more CSI reports, the network can determine the rank limit (Rc) for security of the UE based on the TDCP value.

[0178] Therefore, TDCP becomes a key high-level control variable for feedback reconfiguration based on CSI codebook.

[0179] Other CSI parameters, such as the number of beams, quantization configuration, frequency taps, and frequency subband granularity, can also be reconfigured based on the PMI spatial-frequency coefficients (i.e., beam and time delay taps) and the amplitude and phase data contained in the CQI, and reduced based on the value of Rc.

[0180] In response to the UE, the network provides a rank limit Rc and new configuration index values. Based on these configuration index values, the PMI and / or CQI reporting structures can be modified according to the new configuration provided to the UE.

[0181] According to the example embodiment, the UE learns about the new CSI report structure by having a common set of rules that are also known to the network side.

[0182] In addition to reducing the above reconfiguration under a given rank constraint, the report for each layer can also be reconfigured to reduce and optimize parameters such as the number of beams L or the number of frequency-delay taps M.

[0183] Figure 19 ( Figure 19a and Figure 19b The diagram illustrates an exemplary CSI compression structure on which CSI report calculations are based, and specifically shows the following examples: (a) a Type II CSI report with only spatial compression (i.e., version 15), and (b) a Type II CSI report with spatial-frequency compression (i.e., version 16).

[0184] Figure 19 provides an example of the CSI compression structure on which the CSI report for a given UE is based, which has: (a) spatial compression, i.e., beam domain only like in Type II of Release 15, and (b) joint spatial frequency compression, i.e., beam delay domain characterization like in Type II of Release 16 Enhancement.

[0185] Since spatial and / or frequency compression can be performed separately, the values ​​of L and M can be adjusted based on the observed CSI RS reports and the thresholds established in each parameter.

[0186] According to the example embodiment, the values ​​of L and M can be adjusted based on mobility conditions obtained from TDCP or any other type of useful measurement.

[0187] According to a further example embodiment, frequency compression can be turned off, and then a subband report can be provided. In addition, a broadband report can also be provided if the channel response in the frequency exhibits very flat characteristics.

[0188] Currently, this flexibility is not possible by making Type I and Type II have different types of configurable independent settings, and customization of CSI codebook parameters cannot be performed because joint reconfiguration of parameters for different codebooks is not possible.

[0189] In the example of Figure 19, 16 Tx antennas with L=4 selected beams and N3=13 sub-bands with M=4 taps are configured. For example, considering that the contribution of some weak space-frequency components to the CSI report is negligible, the configuration can be reduced from L=4 beams to L=2 beams and the delay taps from M=4 to M=2. Furthermore, according to the example embodiment, mobility conditions may impose further constraints on these parameters.

[0190] Figure 20This is a schematic diagram of the process according to an example embodiment, and specifically illustrates the further reconfiguration of CSI codebook parameters after mobility and rank conditions have been determined.

[0191] exist Figure 20 The document provides another timing diagram, focusing on further reconfiguration after mobility conditions and rank constraints have been established.

[0192] This allows selection of the number of beams L, the number of delay taps M, and / or subband / wideband frequency reporting configuration.

[0193] The network can provide this parameter reconfiguration, but the UE also has the ability to suggest other values. The reason behind this is that the UE has better visibility into the measured channel and can detect parameters that should be increased, such as increasing the number of beams or delay taps, or switching from wideband to subband. The network, however, lacks the ability to increase these parameters precisely, instead streamlining them based solely on observed CSI reports.

[0194] If such suggested values ​​correspond to the corresponding possible configurations for a given TDCP / RI combination in the codebook definition, then they can only be accepted by the network.

[0195] On the other hand, if the RI / TDCP changes (e.g., the UE speed becomes lower), the network can also infer the necessity of upgrading a set of CSI parameters, and thus a set of possible combinations may change accordingly. A default configuration will then be selected for that RI / TDCP operating point, and further fine-tuning reconfiguration can be performed subsequently.

[0196] Figure 21 This is a graph comparing the results of different CSI feedback codebook configurations according to the example embodiments, and specifically illustrates examples of different CSI feedback codebook configurations with different MU-MIMO performance and different bit overhead as the speed varies.

[0197] like Figure 21 As shown, several CSI codebook configurations with different spatial-frequency CSI representations can each have different bit overheads, where B1, B2, B3, and B4 are B1>B2>B3>B4, respectively. Higher bit overhead and more detailed CSI representations can lead to high performance at low speeds, where CSI aging is not a problem.

[0198] However, due to the effects of Doppler spread, the advantages that these CSI configurations offer at low speeds disappear rapidly at higher speeds.

[0199] This is even more pronounced in MU-MIMO scenarios, where CSI aging makes accurate and reliable interference cancellation difficult during pairing.

[0200] Reconfiguration can be performed by setting different TDCP thresholds to modify the configuration. If frequency compression is enabled, each TDCP threshold yields a given number of beams L and taps M; if frequency compression is disabled, each TDCP threshold yields a given number of subbands.

[0201] According to the example implementation, reconfiguration provides the ability to optimize bit overhead while maximizing achievable performance. For example, NLOS UEs are more susceptible to higher mobility conditions, and the network can prioritize these NLOS UEs to reduce the number of reconfigurable UEs using a uniform codebook. Meanwhile, LOS UEs can use the initial configuration and optionally have the possibility of further reconfiguration, although this may not be necessary if conditions are sufficiently stable.

[0202] Figure 22 The diagram illustrates the results of different CSI feedback codebook configurations according to example embodiments, and specifically shows an example with MU-MIMO simulations for rank 1. Different configurations with different beam numbers are provided for version 16 Enhanced Type II, and version 15 Type I is also included. By accurately defining the unified CSI codebook reconfiguration based on TDCP, throughput as high as the optimal version 16 Enhanced Type II configuration can be maintained.

[0203] exist Figure 22 In this paper, specific MU-MIMO simulations are performed using data obtained from a system-level simulator in an NLOS UE channel scenario, and the simulation results are provided.

[0204] The studied speed ranges include 3 km / h, 15 km / h, 30 km / h, 45 km / h, 60 km / h, and 75 km / h. A single rank is assumed. Different configurations with varying bit overhead are provided for the following: Version 16 Enhanced Type II, where L=1, 2, and 4 and M=7 for N3=13 subbands (i.e., frequency compression enabled); and Version 15 Type I, where 50 PRB (10 MHz bandwidth) is provided for 13 subbands (i.e., frequency compression disabled), with 4 PRB per subband.

[0205] Each configuration provided is assumed to be a subcase of the same codebook with extended configurability for beam number, frequency compression, and / or broadband / subband reporting.

[0206] exist Figure 22 In this context, the average UE throughput is provided for each configuration with a rank of 1.

[0207] In addition, it provides an upper limit for the ideal CSI codebook switching configuration and a lower limit for the worst configuration.

[0208] Curves for CSI reconfiguration based on a unified codebook, with Y=1 and D1=2 ms parameterized using specific TDCP parameters, were obtained.

[0209] like Figure 22 As shown, the threshold configuration achieves the same performance as version 16 type II L=4 at all points. In particular, this means that for the highest test speed without throughput loss, the threshold setting allows for a maximum overall gain of 10.56% on the type I codebook, and also allows for a maximum bit overhead reduction of approximately 20% relative to the version 16 enhanced type II L=4.

[0210] on the other hand, Figure 23 A more comprehensive study of reconfiguration based on the Unified CSI Codebook-TDCP is provided.

[0211] Figure 23 A diagram is shown illustrating the results of different CSI feedback codebook configurations according to an example embodiment, and specifically illustrates different TDCP operating points for codebook-based CSI that enable adaptation of bit overhead to the selected codebook parameterization, including changing the number of beams L and enabling frequency compression to be turned on / off.

[0212] exist Figure 23 In this document, alternative configurations for TDCP threshold selection are provided, as the selection is not unique.

[0213] The standardized TDCP inputs used for codebook reconfiguration will require the selection of explicit definitions of these thresholds from predefined rules and tables.

[0214] It also provides threshold configuration, with a gain of only 4.5% for low speeds, but it can very effectively minimize the bit overhead required for each analysis speed.

[0215] Figure 24 An example table is shown showing codebook parameterization of RI and TDCP as the primary configuration selector in the multi-rank case.

[0216] In detail, Figure 24 The example presented demonstrates how to determine codebook parameter selection using a set of predefined rules.

[0217] Describe the value of the parameter qualitatively to make it easier to explain the concept.

[0218] The two key parameter values ​​are TDCP and RI.

[0219] However, TDCP can be replaced by other types of indicators besides CSI reports, such as indicators from Doppler measurements performed using any other type of reference signal (e.g., SRS).

[0220] As shown, higher mobility values ​​increase the constraints on the codebook, namely, a reduction in the number of beam / delay taps, coarser subband averaging, and lower resolution quantization.

[0221] At the same time, the rank indicator also plays a role, which also depends on the mobility condition, which may restrict the rank to the value Rc.

[0222] Under worst-case mobility conditions, for example, Rc may be forced to maximize several flows or even a single rank.

[0223] In the worst-case mobility scenario, according to the example embodiment, the codebook is reconfigured for single-beam transmission with very coarse subbands or even wideband reporting. Furthermore, quantization is deactivated to the worst-case scenario by setting a fixed unit amplitude for a single selected beam.

[0224] The above processes and functions can be implemented by corresponding functional components, processors, etc., as described below.

[0225] In the foregoing exemplary description of network entities, only functional modules have been used to describe units relevant to understanding the principles of this disclosure. A network entity may include other units required for its corresponding operation. However, descriptions of these units are omitted in this specification. The arrangement of the functional modules of the device is not to be construed as limiting this disclosure, and functionality may be performed by a single block or further divided into sub-blocks.

[0226] When a device (i.e., a network entity (or some other component)) is described in the preceding description as being configured to perform certain functions, this will be interpreted as equivalent to a description stating that a processor or corresponding circuit system (possibly cooperating with computer program code stored in the memory of the respective device) is configured to cause the device to perform at least the functions mentioned above. Furthermore, such functions should be interpreted as being equivalent to those implemented by a circuit system or component specifically configured to perform the corresponding functions (i.e., the expression "a unit configured as..." is interpreted as equivalent to expressions such as "a component for...").

[0227] exist Figure 25 Alternate illustrations of a device according to an example embodiment are depicted. Figure 25As shown, according to an example embodiment, device (access network node or entity) 10' (corresponding to access network node or entity 10) includes a processor 251, a memory 252, and an interface 253 connected via a bus 254, etc. Furthermore, according to an example embodiment, device (terminal) 30' (corresponding to terminal 30) includes a processor 255, a memory 256, and an interface 257 connected via a bus 258, etc., and the devices can be connected via links 259, respectively.

[0228] Processors 251 / 255 and / or interfaces 253 / 257 may also include modems, etc., to facilitate communication over a (hard-wired or wireless) link, respectively. Interfaces 253 / 257 may include suitable transceivers coupled to one or more antennas or communication components for communicating with linked or connected devices (hard-wired or wireless), respectively. Interfaces 253 / 257 are typically configured to communicate with at least one other device (i.e., its interface).

[0229] The memory 252 / 256 may store a corresponding program assumed to include program instructions or computer program code, which, when executed by the corresponding processor, enables the corresponding electronic device or apparatus to operate according to the example embodiment.

[0230] Generally speaking, a corresponding device / apparatus (and / or part thereof) may refer to a component for performing a corresponding operation and / or displaying a corresponding function, and / or a corresponding device (and / or part thereof) may have a function for performing a corresponding operation and / or displaying a corresponding function.

[0231] When a processor (or some other component) is described in the following description as being configured to perform some function, this will be interpreted as equivalent to a description stating that at least one processor (possibly in cooperation with computer program code stored in the memory of the respective device) is configured to cause the device to perform at least the function mentioned above. Furthermore, such function will be interpreted as being equivalent to a component specifically configured to perform the corresponding function (i.e., the statement "a processor configured to [cause the device] to perform xxx" is interpreted as equivalent to a statement such as "a component for xxx").

[0232] According to an example embodiment, the apparatus representing an access network node or entity 10 includes: at least one processor 251, at least one memory 252 including computer program code, and at least one interface 253 configured to communicate with at least another apparatus. The processor (i.e., at least one processor 251 having at least one memory 252 and computer program code) is configured to perform: receiving radio channel quality report configuration feedback information established based on at least one reference signal from a terminal (therefore the apparatus includes corresponding receiving components); performing: generating a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in at least one report configuration parameter (therefore the apparatus includes corresponding generating components); and performing: sending information indicating the modified radio channel quality report configuration for the terminal to the terminal (therefore the apparatus includes corresponding sending components).

[0233] According to an example embodiment, the apparatus representing terminal 30 includes: at least one processor 255, at least one memory 256 including computer program code, and at least one interface 257 configured to communicate with at least another apparatus. The processor (i.e., at least one processor 255 having at least one memory 256 and computer program code) is configured to: send radio channel quality report configuration feedback information established based on at least one reference signal to an access network entity (therefore the apparatus includes corresponding components for sending); perform: receive from the access network entity information indicating a modified radio channel quality report configuration for the terminal, the modified radio channel quality report configuration for the terminal differing from the initial radio channel quality report configuration of the terminal in that at least one report configuration parameter is included (therefore the apparatus includes corresponding components for receiving); and perform: determine a modified radio channel quality report configuration for the terminal based on the information indicating the modified radio channel quality report configuration for the terminal (therefore the apparatus includes corresponding components for determining).

[0234] For further details regarding the operability / function of each device, please refer to the following: Figures 1 to 24 Any of the above descriptions can be referenced.

[0235] For the purposes of this disclosure as described above, it should be noted that - Method steps that may be implemented as part of software code and run on a processor at a network server or network entity (as an example of a device, apparatus and / or its modules, or as an example of an entity including an apparatus and / or its modules) are independent of the software code and can be specified using any known or future-developed programming language, provided that the functionality defined by the method steps is preserved; - Generally, any method steps are suitable to be implemented as software or by hardware without changing the idea of ​​the embodiment and its modifications in terms of the functionality implemented; - The method steps and / or devices, units, or components may be implemented as hardware components at the above-described apparatus, or any module thereof (e.g., a device that performs the function of the apparatus according to the embodiments described above) may be hardware-independent and may be implemented using any known or future-developed hardware technology or any mixture of the following: MOS (Metal-Oxide-Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar MOS), BiCMOS (Bipolar CMOS), ECL (Emitter-Coupled Logic), TTL (Transistor-Transistor Logic), etc., for example using ASIC (Application-Specific Integrated Circuit) components, FPGA (Field-Programmable Gate Array) components, CPLD (Complex Programmable Logic Device) components, or DSP (Digital Signal Processor) components; - Devices, units, or components (e.g., network entities or network registers as defined above, or any of their respective units / components) may be implemented as individual devices, units, or components, but this does not preclude them from being implemented in a distributed manner throughout the system, as long as the functionality of the devices, units, or components is preserved; - Devices similar to user equipment and network entities / network registers can be represented by semiconductor chips, chipsets or (hardware) modules including such chips or chipsets; however, this does not preclude the possibility that the functionality of the device or module, rather than being hardware-implemented, is implemented as software in (software) modules, such as computer programs or computer program products including executable software code portions for execution / running on a processor. - For example, a device can be considered as an apparatus or a combination of more than one apparatus, whether they are functionally cooperative or functionally independent but housed in the same device housing.

[0236] Generally, it should be noted that if it is only suitable for performing the functions described in the corresponding section, then the corresponding functional modules or elements according to the aspects described above can be implemented in hardware and / or software by any known components. The above method steps can be implemented in a separate functional module or by a separate device, or one or more method steps can be implemented in a single functional module or by a single device.

[0237] Generally, without altering the spirit of this disclosure, any method steps are suitable for implementation as software or by hardware. Devices and components may be implemented as individual devices, but this does not preclude their implementation in a distributed manner throughout the system, provided that the functionality of the devices is preserved. These and similar principles are considered to be known to those skilled in the art.

[0238] In the sense of this specification, software includes software code, which includes code components or portions for performing corresponding functions, or computer programs or computer program products, as well as software (or computer programs or computer program products) embodied on a tangible medium (such as a computer-readable (storage) medium) having corresponding data structures or code components / portions stored thereon, or potentially embodied in signals or chips during its processing.

[0239] This disclosure also covers any conceivable combination of the above-described method steps and operations, as well as any conceivable combination of the above-described nodes, devices, modules or elements, provided that the concepts of the above-described method and structural arrangement are applicable.

[0240] In view of the above, measures for flexible channel state information configuration are provided. Examples of such measures include: receiving radio channel quality report configuration feedback information established based on at least one reference signal from a terminal; generating a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and the radio channel quality report configuration feedback information, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is specified; and sending information to the terminal indicating the modified radio channel quality report configuration for the terminal.

[0241] Although the present disclosure has been described above with reference to the accompanying drawings, it should be understood that the disclosure is not limited thereto. Rather, it will be apparent to those skilled in the art that the disclosure can be modified in many ways without departing from the scope of the inventive concept disclosed herein.

[0242] At least the following example items are covered by the above: Item 1. A method for accessing a network entity, the method comprising: Receive radio channel quality report configuration feedback information from the terminal, which is established based on at least one reference signal. Based on the initial radio channel quality report configuration for the terminal and the feedback information of the radio channel quality report configuration, a modified radio channel quality report configuration for the terminal is generated. The modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is included. Send information to the terminal indicating the modified radio channel quality report configuration for the terminal.

[0243] Item 2. The method according to item 1 further includes: Based on the terminal's radio channel quality reporting capability, an initial radio channel quality report configuration for the terminal is generated. This initial radio channel quality report configuration includes at least one report configuration parameter. Send information to the terminal indicating the initial radio channel quality report configuration for the terminal, and Send the at least one reference signal.

[0244] Item 3. The method according to item 2 further includes: Receive information from the terminal regarding the terminal's ability to report radio channel quality.

[0245] Item 4. The method according to item 2 or 3, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

[0246] Item 5. The method according to any one of items 1 to 4, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

[0247] Item 6. The method according to Item 5, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

[0248] Item 7. The method according to any one of items 1 to 6, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

[0249] Item 8. The method according to any one of items 1 to 7, wherein Regarding the generation of the modified radio channel quality report configuration for the terminal, the method further includes: Referring to at least one stored table, said at least one stored table includes a radio channel quality report configuration definition, and The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes configured for the modified radio channel quality report in the at least one stored table, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

[0250] Item 9. The method according to any one of items 1 to 8, further comprising: Receive information from the terminal regarding at least one suggested report configuration parameter to be modified, wherein Regarding the generation of the modified radio channel quality report configuration for the terminal, the method further includes: When generating the modified radio channel quality report configuration for the terminal, the at least one suggested report configuration parameter to be modified is taken into account.

[0251] Item 10. A method for a terminal, the method comprising: Send radio channel quality report configuration feedback information based on at least one reference signal to the access network entity. The access network entity receives information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is included. The modified radio channel quality report configuration for the terminal is determined based on the information indicating the modified radio channel quality report configuration for the terminal.

[0252] Item 11. The method according to item 10 further includes: The access network entity receives information indicating the initial radio channel quality report configuration for the terminal, wherein the initial radio channel quality report configuration for the terminal includes at least one report configuration parameter. Receive the at least one reference signal, and Based on the at least one reference signal and the initial radio channel quality report configuration for the terminal, the radio channel quality report configuration feedback information is generated.

[0253] Item 12. The method according to item 10 or 11 further includes: Send information about the terminal's radio channel quality reporting capability to the access network entity.

[0254] Item 13. The method according to Item 12, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

[0255] Item 14. The method according to any one of items 10 to 13, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

[0256] Item 15. The method according to Item 14, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

[0257] Item 16. The method according to any one of items 10 to 15, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

[0258] Item 17. The method according to any one of items 10 to 16, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes to the modified radio channel quality report configuration in at least one stored table, wherein the at least one stored table includes a radio channel quality report configuration definition, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

[0259] Item 18. The method according to any one of items 10 to 17 further comprises: Based on observed radio channel quality behavior, determine at least one recommended reporting configuration parameter to be modified, and Send information about the at least one proposed report configuration parameter to be modified to the access network entity.

[0260] Item 19. An apparatus for an access network entity, the apparatus comprising: The receiving circuitry system is configured to receive radio channel quality report configuration feedback information established based on at least one reference signal from the terminal. A generation circuit system is configured to: generate a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and feedback information from the initial radio channel quality report configuration, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter, and The transmitting circuitry is configured to transmit to the terminal information indicating the modified radio channel quality report configuration for the terminal.

[0261] Item 20. The apparatus according to item 19 further includes: The generation circuitry is configured to: generate an initial radio channel quality report configuration for the terminal based on the terminal's radio channel quality report capability, wherein the initial radio channel quality report configuration for the terminal includes at least one report configuration parameter. The transmitting circuit system is configured as follows: Send information to the terminal indicating the initial radio channel quality report configuration for the terminal, and Send the at least one reference signal.

[0262] Item 21. The apparatus according to item 20, further comprising: A receiving circuit system is configured to receive information from the terminal regarding the terminal's radio channel quality reporting capability.

[0263] Item 22. The apparatus according to item 20 or 21, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

[0264] Item 23. The apparatus according to any one of items 19 to 22, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

[0265] Item 24. The apparatus according to item 23, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

[0266] Item 25. The apparatus according to any one of items 19 to 24, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

[0267] Item 26. The apparatus according to any one of items 19 to 25, further comprising: A reference circuit system is configured to reference at least one stored table, said at least one stored table including a radio channel quality report configuration definition, and wherein... The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes configured for the modified radio channel quality report in the at least one stored table, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

[0268] Item 27. The apparatus according to any one of items 19 to 26, further comprising: The receiving circuitry is configured to receive from the terminal information regarding at least one suggested report configuration parameter to be modified, and The circuit system is configured to take into account the at least one suggested report configuration parameter to be modified when generating the modified radio channel quality report configuration for the terminal.

[0269] Item 28. A terminal apparatus, the apparatus comprising: The transmitting circuitry is configured to send radio channel quality report configuration feedback information, established based on at least one reference signal, to the access network entity. A receiving circuitry system is configured to receive from the access network entity information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is specified. A circuit system is configured to determine the modified radio channel quality report configuration for the terminal based on information indicating the modified radio channel quality report configuration for the terminal.

[0270] Item 29. The apparatus according to item 28 further includes: The receiving circuit system is configured as follows: The access network entity receives information instructing the initial radio channel quality report configuration for the terminal, the initial radio channel quality report configuration for the terminal including at least one report configuration parameter, and Receive the at least one reference signal, and The generation circuit system is configured to generate radio channel quality report configuration feedback information based on the at least one reference signal and the initial radio channel quality report configuration for the terminal.

[0271] Item 30. The apparatus according to item 28 or 29 further includes: The transmitting circuitry is configured to send information about the terminal's radio channel quality reporting capability to the access network entity.

[0272] Item 31. The apparatus according to item 30, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

[0273] Item 32. The apparatus according to any one of items 28 to 31, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

[0274] Item 33. The apparatus according to item 32, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

[0275] Item 34. The apparatus according to any one of items 28 to 33, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

[0276] Item 35. The apparatus according to any one of items 28 to 34, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes on the modified radio channel quality report configuration in at least one stored table, wherein the at least one stored table includes a radio channel quality report configuration definition, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

[0277] Item 36. The apparatus according to any one of items 28 to 35, further comprising: The circuit system is configured to: determine at least one recommended reporting configuration parameter to be modified based on observed radio channel quality behavior, and The transmitting circuitry is configured to send information to the access network entity regarding the at least one proposed report configuration parameter to be modified.

[0278] Item 37. An apparatus for an access network entity, the apparatus comprising: At least one processor, and At least one memory storing instructions, which, when executed by the at least one processor, cause the device to perform at least the following: Receive radio channel quality report configuration feedback information from the terminal, which is established based on at least one reference signal. Based on the initial radio channel quality report configuration for the terminal and the feedback information of the radio channel quality report configuration, a modified radio channel quality report configuration for the terminal is generated. The modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is included. Send information to the terminal indicating the modified radio channel quality report configuration for the terminal.

[0279] Item 38. The apparatus according to item 37, wherein The instructions, when executed by the at least one processor, cause the device to perform at least the following: Based on the terminal's radio channel quality reporting capability, an initial radio channel quality report configuration for the terminal is generated. This initial radio channel quality report configuration includes at least one report configuration parameter. Send information to the terminal indicating the initial radio channel quality report configuration for the terminal, and Send the at least one reference signal.

[0280] Item 39. The apparatus according to item 38, wherein The instructions, when executed by the at least one processor, cause the device to perform at least the following: Receive information from the terminal regarding the terminal's ability to report radio channel quality.

[0281] Item 40. The apparatus according to item 38 or 39, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

[0282] Item 41. The apparatus according to any one of items 37 to 40, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

[0283] Item 42. The apparatus according to item 41, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

[0284] Item 43. The apparatus according to any one of items 37 to 42, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

[0285] Item 44. The apparatus according to any one of items 37 to 43, wherein Regarding the configuration for generating the modified radio channel quality report for the terminal, the instructions, when executed by the at least one processor, cause the device to perform at least the following: Referring to at least one stored table, said at least one stored table includes a radio channel quality report configuration definition, and The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes configured for the modified radio channel quality report in the at least one stored table, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

[0286] Item 45. The apparatus according to any one of items 37 to 44, wherein The instructions, when executed by the at least one processor, cause the device to perform at least the following: Receive information from the terminal regarding at least one suggested report configuration parameter to be modified, wherein Regarding the configuration for generating the modified radio channel quality report for the terminal, the instructions, when executed by the at least one processor, cause the device to perform at least the following: When generating the modified radio channel quality report configuration for the terminal, the at least one suggested report configuration parameter to be modified is taken into account.

[0287] Item 46. A terminal apparatus, the apparatus comprising: At least one processor, and At least one memory storing instructions, which, when executed by the at least one processor, cause the device to perform at least the following: Send radio channel quality report configuration feedback information based on at least one reference signal to the access network entity. The access network entity receives information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in at least one aspect of the report configuration parameter, and The modified radio channel quality report configuration for the terminal is determined based on the information indicating the modified radio channel quality report configuration for the terminal.

[0288] Item 47. The apparatus according to item 46, wherein The instructions, when executed by the at least one processor, cause the device to perform at least the following: The access network entity receives information indicating the initial radio channel quality report configuration for the terminal, wherein the initial radio channel quality report configuration for the terminal includes at least one report configuration parameter. Receive the at least one reference signal, and Based on the at least one reference signal and the initial radio channel quality report configuration for the terminal, the radio channel quality report configuration feedback information is generated.

[0289] Item 48. The apparatus according to item 46 or 47, wherein The instructions, when executed by the at least one processor, cause the device to perform at least the following: Send information about the terminal's radio channel quality reporting capability to the access network entity.

[0290] Item 49. The apparatus according to item 48, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

[0291] Item 50. The apparatus according to any one of items 46 to 49, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

[0292] Item 51. The apparatus according to item 50, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

[0293] Item 52. The apparatus according to any one of items 46 to 51, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

[0294] Item 53. The apparatus according to any one of items 46 to 52, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes to the modified radio channel quality report configuration in at least one stored table, wherein the at least one stored table includes a radio channel quality report configuration definition, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

[0295] Item 54. The apparatus according to any one of items 46 to 53, wherein The instructions, when executed by the at least one processor, cause the device to perform at least the following: Based on observed radio channel quality behavior, determine at least one recommended reporting configuration parameter to be modified, and Send information about the at least one proposed report configuration parameter to be modified to the access network entity.

[0296] Item 55. A computer program product comprising computer-executable computer program code, wherein when the program is run on a computer, the computer-executable computer program code is configured to cause the computer to perform the method according to any one of items 1 to 9 or 10 to 18.

[0297] Item 56. The computer program product according to Item 55, wherein the computer program product includes a computer-readable medium having computer program code executable thereon stored thereon, and / or wherein the program can be directly loaded into the computer's internal memory or its processor.

[0298] List of acronyms and abbreviations

Claims

1. A method for accessing a network entity, the method comprising: Receive radio channel quality report configuration feedback information from the terminal, which is established based on at least one reference signal. Based on the initial radio channel quality report configuration for the terminal and the feedback information of the radio channel quality report configuration, a modified radio channel quality report configuration for the terminal is generated. The modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is included. Send information to the terminal indicating the modified radio channel quality report configuration for the terminal.

2. The method according to claim 1, further comprising: Based on the terminal's radio channel quality reporting capability, an initial radio channel quality report configuration for the terminal is generated. This initial radio channel quality report configuration includes at least one report configuration parameter. Send information to the terminal indicating the initial radio channel quality report configuration for the terminal, and Send the at least one reference signal.

3. The method according to claim 2, further comprising: Receive information from the terminal regarding the terminal's ability to report radio channel quality.

4. The method according to claim 2 or 3, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

5. The method according to any one of claims 1 to 4, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

6. The method according to claim 5, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

7. The method according to any one of claims 1 to 6, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

8. The method according to any one of claims 1 to 7, wherein Regarding the generation of the modified radio channel quality report configuration for the terminal, the method further includes: Referring to at least one stored table, said at least one stored table includes a radio channel quality report configuration definition, and The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes configured for the modified radio channel quality report in the at least one stored table, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

9. The method according to any one of claims 1 to 8, further comprising: Receive information from the terminal regarding at least one suggested report configuration parameter to be modified, wherein Regarding the generation of the modified radio channel quality report configuration for the terminal, the method further includes: When generating the modified radio channel quality report configuration for the terminal, the at least one suggested report configuration parameter to be modified is taken into account.

10. A method for a terminal, the method comprising: Send radio channel quality report configuration feedback information based on at least one reference signal to the access network entity. The access network entity receives information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is included. The modified radio channel quality report configuration for the terminal is determined based on the information indicating the modified radio channel quality report configuration for the terminal.

11. The method of claim 10, further comprising: The access network entity receives information indicating the initial radio channel quality report configuration for the terminal, wherein the initial radio channel quality report configuration for the terminal includes at least one report configuration parameter. Receive the at least one reference signal, and Based on the at least one reference signal and the initial radio channel quality report configuration for the terminal, the radio channel quality report configuration feedback information is generated.

12. The method according to claim 10 or 11, further comprising: Send information about the terminal's radio channel quality reporting capability to the access network entity.

13. The method of claim 12, wherein The radio channel quality reporting capability of the terminal includes at least one of the following: The terminal's space compression support capability, or The terminal's subband / wideband reporting capability, or The terminal's frequency compression support capability, or The terminal's time prediction support capability, or The terminal's time compression support capability, or The terminal's quantization capability.

14. The method according to any one of claims 10 to 13, wherein The radio channel quality report configuration feedback information includes at least one of the following: Information included in the channel state information report, or A reference signal sent by at least one terminal.

15. The method of claim 14, wherein The information included in the channel state information report includes at least one of the following: rank indicator value, or A set of time-domain channel attribute values, or A set of precoded matrix indicators, or A set of channel quality indicator values.

16. The method according to any one of claims 10 to 15, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: Information about rank restrictions on rank indicators, or Information about the type of channel state information calculation, or Information about the number of space beams, or Information about the number of delayed taps, or Information regarding the quantization settings of the channel state information coefficients, or Information regarding broadband or subband reporting settings, or Information about frequency compression activation or deactivation, or Information regarding channel state information that predicts activation or deactivation, or Information regarding the configuration of the reference signal.

17. The method according to any one of claims 10 to 16, wherein The information indicating the modified radio channel quality report configuration includes at least one of the following: A set of indexes to the modified radio channel quality report configuration in at least one stored table, wherein the at least one stored table includes a radio channel quality report configuration definition, or The at least one report configuration parameter that is different from the initial radio channel quality report configuration used for the terminal.

18. The method according to any one of claims 10 to 17, further comprising: Based on observed radio channel quality behavior, determine at least one recommended reporting configuration parameter to be modified, and Send information about the at least one proposed report configuration parameter to be modified to the access network entity.

19. An apparatus for an access network entity, the apparatus comprising: The receiving circuitry system is configured to receive radio channel quality report configuration feedback information established based on at least one reference signal from the terminal. A generation circuit system is configured to: generate a modified radio channel quality report configuration for the terminal based on an initial radio channel quality report configuration for the terminal and feedback information of the radio channel quality report configuration, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter, and The transmitting circuitry is configured to transmit to the terminal information indicating the modified radio channel quality report configuration for the terminal.

20. A terminal apparatus, the apparatus comprising: The transmitting circuitry is configured to send radio channel quality report configuration feedback information, established based on at least one reference signal, to the access network entity. A receiving circuitry system is configured to receive from the access network entity information indicating a modified radio channel quality report configuration for the terminal, wherein the modified radio channel quality report configuration for the terminal differs from the initial radio channel quality report configuration for the terminal in that at least one report configuration parameter is specified. The circuit system is configured to: determine the modified radio channel quality report configuration for the terminal based on information indicating the modified radio channel quality report configuration for the terminal.

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